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This standard cylindrical style addition funnel has a standard taper top outer joint and standard taper lower inner joint which are both the same size. This item features a pressure-equalizing arm and a 2mm glass stopcock on sizes 250 mL and less and a 4 mm glass stopcock on sizes 500 mL or greater. Comes with a stopper (replacement item # CG-3000).
The replacement glass stopcock plug for this item is item # CG-400-XX.